Thermostat Wiring For Dummies - A Step By Step Guide Wrapping old wire in electric tape protects you and the system from any type of past or future damage. It’s a cheap protective layer that is necessary for all installations. Installing The Wrong Thermostat Type – Always install a thermostat to its compatible base. So 4/4 and 5/5 when dealing with the wire setup. How do I wire my thermostat? - Honeywell Home Next, let's talk about the C, or common wire. If you have a Trane model thermostat, and have a wire labeled X or B refer to your thermostat manual. In some cases, one of those wires may be your common. If you have a C wire, place it into the C terminal on your wall plate. Let's take a look at the G wire.
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